This guide will repair most of P920/SU760 devices that have been flashed with wrong ROM packages and cannot enter DOWNLOAD MODE anymore.
If something doesn't work for you make a post describing exactly what you did , your phone model and your operating system.
Before making pointless posts READ THE GUIDE.
If you don't know how to make one of the recovery programs work READ THEIR GUIDE .
You can find links in the end of this post.
This guide requires that you have installed correct LG DRIVERS and you have a working NORMAL LG USB CABLE also you need to do this with a good battery.
You will need to download the following tools.
WKPARKS omap4boot port of SU760/SU870 + u-boot port of SU760/SU870 from here
LGFlashTool(for LGFLASHTOOL Installation guide read this )
P920 users should use BOOTV21E.RAR FROM HERE
(BOOTV21E has all necessary partitions to FULLY REPAIR your P920 with V21E ROM files including CWM TOUCH RECOVERY)
SU760 users should use SU760V10GROM.zip FROM HERE
Before you start READ THE GUIDE once so you can understand it and then proceed with repair.
Install LGflashtool (also copy/paste crack)
P920 users should run LG FlashTool and load BOOTV21E_AP.bin (ONLY THE AP.BIN FILE) and keep it open but NOT ready for flashing.
SU760 users should run LG FlashTool and load SU760V10GROM (ONLY THE AP.BIN FILE) and keep it open but NOT ready for flashing.
Extract WKPARKS omap4boot and follow installation steps:
Install OMAP4430 USB driver
If you plug your Phone on PC without battery, OMAP4430 device appeared for seconds and then disappeared in your Windows Device Manager
(check arsen4oo photo guide in post #3)
On windows 7 sometimes OMAP4430 flashes too fast so you cant install driver.
There is a a windows feature that will help you install the driver easier.
To view devices that were once installed but are no longer attached to the computer, open a Command Prompt window using the Run As Administrator option and enter the command:
Then, from the same command prompt, type devmgmt.msc to open Device Manager. Choose View, Show Hidden Devices. The new instance of Device Manager will show “ghosted” entries for devices that were once present. This technique is especially useful for fixing problems caused by leftover drivers after replacing a network card or video card—you can easily delete the ghosted device or update the OMAP4430 driver.
After driver installation ends remove usb cable BUT keep windows device manager open.
Step 3. Run start_fastboot.bat and select option 2
Step 4. Pull out battery
Step 5. Hold Vol+
Step 6. Connect USB cable, the usbboot will start
Step 7. Insert battery while the usbboot is waiting
Step 8. Script tells you to remove cable but i dont think it's necessary in this version
Step 9. Release Vol+ and look in your Windows Device manager
If everything worked ok your phone got recognised and now you are in downoad mode.
Step 10. Change LG USB Serial Port according to LG FlashTool Guide to port 41.
Step 11. Remove cable and battery from P920/SU760
Step 12. Set LG FlashTool ready for flashing.
Step 13. Run Steps 3-9 again and you will see your phone being flashed from LG FlashTool.
It will be stopped at 26-30% because phone will turn off on its own BUT the next time you try to enter NORMAL DOWNLOAD MODE it will be available again.
Step 14. Set LG FlashTool ready to flash your P920 with BOOTV21E_AP.bin again.
SU760 users should use SU760V10GROM bin .
Step 15. Put your phone in DOWNLOAD MODE without using omap4boot this time.
Step 16. LG FlashTool will recognise the phone and flash it completely this time.
P920 after reboot will go to CWM. You can flash your personal backup or reboot to STOCK V21E.
Step 17. After repairing your P920/SU760 YOU PROBABLY HAVE TO FIX YOUR IMEI...(and maybe your wifi mac address) follow these steps:
1.Connect phone by USB
2.Activate USB debug mode
3.Enter 3845#*920# in dialer if that doesn’t work try 3845#*925# or 3845#*720# if device is SU760
4.Select Port Settings -> Select CP Image Download
5.A new device should appear at let it install
6.Open Tutty (or hyperterminal) and select serial protocol. Click on open
7.Type AT if response is not OK, change port number (it is possible that when typing you don’t see any letters)
8.Type at%imei, it should display a dummy IMEI
9.Type at%imei=x,x,x,x,x,x,x,x,x,x,x,x,x,x,x where x,x,x... is your orginal IMEI number (found under the battery of your phone). It should response IMEI WRITE OK
If you don't understand how to do this read this thread [GUIDE] Unlock Phone / Recover IMEI
Extra Step for P920 User's
After procedure ends use the rebooter utility and select option 2 like below..
Info: This utility will not work if you don't have Omap Drivers installed Select task: 1. Flash ICS FastbootLoaders+Recovery 2. Flash V21E Loaders+Recovery x. Exit ---------------------------------------- Please select 1,2 or exit(x): 2 Ready to Flash V21E+recovery waiting for OMAP44xx device... Device descriptor: bLength = 18 bDescriptorType = 1 bcdUSB = 528 bDeviceClass = 255 bDeviceSubClass = 255 bDeviceProtocol = 255 bMaxPacketSize0 = 64 idVendor = 451 idProduct = D00F bcdDevice = 0 iManufacturer = 33 iProduct = 37 iSerialNumber = 0 bNumConfigurations = 1 reading ASIC ID usb_write 4 usb_read 81 [*] read 0 bytes NumOfSubblocks: 0x5 Subblock ID: 0x1 Subblock Size: 0x5 CH enabled: 0x7 ROM revision: 0x3 Checksum Subblock: 0x15 CHIP: 4430 IDEN: 40a11fbe08c36fb34f6a113fc2516c63395c7947 MPKH: 5f4092eccddf90fa43f546adf89508b31b9c74795e9516194c0ea6412fdcb7f6 CRC0: 0983f41c CRC1: 139c4f4f sending 2ndstage to target... f0030002 usb_write 4 usb_write 4 wait 5-seconds... [*] msg size = 4 usb_write 21504 [*] data size = 21504 usb_close Reopen usb... Device descriptor: bLength = 18 bDescriptorType = 1 bcdUSB = 528 bDeviceClass = 255 bDeviceSubClass = 255 bDeviceProtocol = 255 bMaxPacketSize0 = 64 idVendor = 451 idProduct = D00F bcdDevice = 0 iManufacturer = 33 iProduct = 37 iSerialNumber = 0 bNumConfigurations = 1 waiting for 2ndstage response... usb_read 4 usb read = aabbccdd accepted 2ndstage response sending image to target... size = 232512 usb_write 4 usb_write 232512 ** Done ** < waiting for device > sending 'recovery' (5854 KB)... OKAY [ 3.012s] writing 'recovery'... OKAY [ 1.230s] finished. total time: 4.252s sending 'u-boot' (512 KB)... OKAY [ 0.268s] writing 'u-boot'... OKAY [ 0.355s] finished. total time: 0.627s sending 'x-loader' (128 KB)... OKAY [ 0.070s] writing 'x-loader'... OKAY [ 0.051s] finished. total time: 0.127s Loaders have been flashed. Your P920 is ready to boot into GB again. Reboot. Microsoft Windows [Version 6.1.7600] Copyright (c) 2009 Microsoft Corporation. All rights reserved.
GOOD LUCK and lets get those bricks fixed.
If you get this screen on P920/SU760 you are in FASTBOOT MODE.
If you get messages like this you probably have a BAD CABLE.
Other Guides that you should read in order to help you restore your P920/SU760:
adixtra ◘►◘►[FLASH + ROMS][v20B.KDZ] KDZ Files on WINDOWS 7 (64) & XP + Download◄◘◄◘
pandaball's [GUIDE] Recovering from brick/bootloop
marti701 LG [TUTORIAL] Flash BIN rom, Unbrick, Update - Optimus 3d (Service Flash software)
The Dark Lestat's [GUIDES/TOOLS]Making Developing/Flashing/Returning to Stock Easier